diff --git a/lisp/net/eudc-vars.el b/lisp/net/eudc-vars.el
index bc939e0d396..bb1474b8b5b 100644
--- a/lisp/net/eudc-vars.el
+++ b/lisp/net/eudc-vars.el
@@ -1,4 +1,4 @@
-;;; eudc-vars.el --- Emacs Unified Directory Client
+;;; eudc-vars.el --- Emacs Unified Directory Client  -*- lexical-binding: t -*-
 
 ;; Copyright (C) 1998-2020 Free Software Foundation, Inc.